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      <h1 class="post-title">4.C#类型转换</h1>

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        <span class="post-time"> 2016-05-25 </span>
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            <a href="/categories/cshape/"> CShape </a>
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          <span class="more-meta"> 约 547 字 </span>
          <span class="more-meta"> 预计阅读 2 分钟 </span>
        
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        <li><a href="#4类型转换">4.类型转换</a>
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            <li><a href="#c类型转换方法">C#类型转换方法</a></li>
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      <h2 id="4类型转换">4.类型转换</h2>
<hr>
<p>类型转换从根本上说是类型铸造，或者说是把数据从一种类型转换为另一种类型。在C#中，类型铸造有两种形式：</p>
<ul>
<li>隐式类型转换 - 这些转换是C#默认的以安全的方式进行的转换。例如：从小的整数类型转换为大的整数类型，从派生类转换为基类。</li>
</ul>
<ul>
<li>显示类型转换 - 这些转换是通过用户使用预定义的函数显示完成的。显示转换需要强制转换运算符。
强制类型转换：</li>
</ul>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt"> 1
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-c#" data-lang="c#"><span class="line"><span class="cl"><span class="k">namespace</span> <span class="nn">TypeConversionApplication</span>
</span></span><span class="line"><span class="cl"><span class="p">{</span>
</span></span><span class="line"><span class="cl">    <span class="k">class</span> <span class="nc">ExplicitConversion</span>
</span></span><span class="line"><span class="cl">    <span class="p">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">static</span> <span class="k">void</span> <span class="n">Main</span><span class="p">(</span><span class="kt">string</span><span class="p">[]</span> <span class="n">args</span><span class="p">)</span>
</span></span><span class="line"><span class="cl">        <span class="p">{</span>
</span></span><span class="line"><span class="cl">            <span class="kt">double</span> <span class="n">d</span> <span class="p">=</span> <span class="m">567.89</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">            <span class="kt">int</span> <span class="n">i</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">            <span class="c1">// 强制转换double 为 int</span>
</span></span><span class="line"><span class="cl">            <span class="n">i</span> <span class="p">=</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="n">d</span><span class="p">;</span>
</span></span><span class="line"><span class="cl">     <span class="n">Console</span><span class="p">.</span><span class="n">WriteLine</span><span class="p">(</span><span class="n">i</span><span class="p">);</span>
</span></span><span class="line"><span class="cl">        <span class="p">}</span>
</span></span><span class="line"><span class="cl">    <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-C#" data-lang="C#"><span class="line"><span class="cl"><span class="m">567</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h3 id="c类型转换方法">C#类型转换方法</h3>
<p>C#提供了下列内置的类型转换方法
|序号|方法&amp;描述|
|———|——————|
|1  |ToBoolean 如果可能的话，把类型转换为布尔型|
|2  |ToByte 把类型转换为字节类型|
|3  |ToChar 把类型转换为单个Unicode字符类型|
|4  |ToDataTime 把类型(整数或字符串类型)转换为 日期-时间 结构|
|5  |ToDecimal 把浮点或整型类型转换为十进制类型|
|6  |ToDouble 把类型转换为双精度浮点数|
|7  |ToInt16 把类型转换为16位整数类型|
|8  |ToInt32 把类型转换为32位整数类型|
|9  |ToInt64 把类型转换为64位整数类型|
|10 |ToSbyte 把类型转换为有符号字节类型|
|11 |ToSingle 把类型转换为小浮点数类型|
|12 |ToString 把类型转换为字符串类型|
|13 |ToType 把类型转换为指定类型|
|14 |ToUInt16 把类型转换为16位无符号整数类型|
|15 |ToUInt32 把类型转换为32位无符号整数类型|
|16 |ToUInt64 把类型转换为64位无符号整数类型|</p>

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